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  • 1
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    Biallelic inactivation of BRCA2 in Fanconi anemia (2002)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2002-06-18
    Description: Fanconi anemia (FA) is a rare autosomal recessive cancer susceptibility disorder characterized by cellular hypersensitivity to mitomycin C (MMC). Six FA genes have been cloned, but the gene or genes corresponding to FA subtypes B and D1 remain unidentified. Here we show that cell lines derived from FA-B and FA-D1 patients have biallelic mutations in BRCA2 and express truncated BRCA2 proteins. Functional complementation of FA-D1 fibroblasts with wild-type BRCA2 complementary DNA restores MMC resistance. Our results link the six cloned FA genes with BRCA1 and BRCA2 in a common pathway. Germ-line mutation of genes in this pathway may result in cancer risks similar to those observed in families with BRCA1 or BRCA2 mutations.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Howlett, Niall G -- Taniguchi, Toshiyasu -- Olson, Susan -- Cox, Barbara -- Waisfisz, Quinten -- De Die-Smulders, Christine -- Persky, Nicole -- Grompe, Markus -- Joenje, Hans -- Pals, Gerard -- Ikeda, Hideyuki -- Fox, Edward A -- D'Andrea, Alan D -- P01HL54785/HL/NHLBI NIH HHS/ -- R01DK43889/DK/NIDDK NIH HHS/ -- R01HL52725/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 2002 Jul 26;297(5581):606-9. Epub 2002 Jun 13.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pediatric Oncology, Children's Hospital, Harvard Medical School, 44 Binney Street, Boston, MA 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12065746" target="_blank"〉PubMed〈/a〉
    Keywords: Alleles ; Amino Acid Sequence ; BRCA2 Protein/chemistry/genetics/*metabolism ; Cell Line ; DNA Damage ; Fanconi Anemia/*genetics ; Female ; Fibroblasts ; Frameshift Mutation ; Gene Silencing ; Genes, BRCA1 ; *Genes, BRCA2 ; Genetic Complementation Test ; Germ-Line Mutation ; Homozygote ; Humans ; Male ; Mitomycin/pharmacology ; Molecular Sequence Data ; *Mutation ; Pedigree ; Phenotype ; Protein Isoforms ; RNA, Messenger/genetics/metabolism ; Reverse Transcriptase Polymerase Chain Reaction ; Transfection
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
    Electronic Resource
    Electronic Resource
    Relationship between cadmium sensitivity and degree of plasma membrane fatty acid unsaturation in Saccharomyces cerevisiae (1997)
    Springer
    Applied microbiology and biotechnology 48 (1997), S. 539-545 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The sensitivity of Saccharomyces cerevisiae to the redox-active metal copper has recently been found to be influenced by cellular fatty acid composition. This study sought to investigate whether fatty acid composition affected plasma membrane permeabilisation and whole-cell toxicity induced by the redox-inactive metal cadmium. S. cerevisiae NCYC 1383 was enriched with the polyunsaturated fatty acids linoleate (18:2) and linolenate (18:3) by growth in 18:2- or 18:3-supplemented medium. Incorporation of the exogenous fatty acids resulted in them comprising more than 65% of the total fatty acids in plasma membrane lipids. Inhibition of cell division in the presence of Cd(NO3)2 was accentuated by growth in the presence of a polyunsaturated fatty acid. Furthermore, susceptibility to Cd2+-induced plasma membrane permeabilisation increased with the degree of fatty acid unsaturation. Thus, during exposure to Cd2+, K+ efflux from 18:2- and 18:3-enriched cells was up to 2.5-fold or 3-fold greater, respectively than that from unsupplemented cells. In addition, reductions in cell viability during exposure to Cd2+ were most marked in polyunsaturated-fatty-acid-supplemented cells. At certain times, unsupplemented Cd2+-exposed cells displayed up to 7-fold greater viability than supplemented Cd2+-exposed cells. The study demonstrates that the toxicity of the redox-inactive metal Cd2+ towards S. cerevisiae becomes markedly amplified with increased cellular and plasma membrane fatty acid unsaturation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002530051093
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  • 3
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    p21 promotes error-free replication-coupled DNA double-strand break repair (2012)
    Oxford University Press
    Details
    Publication Date: 2012-09-27
    Description: p21 is a well-established regulator of cell cycle progression. The role of p21 in DNA repair, however, remains poorly characterized. Here, we describe a critical role of p21 in a replication-coupled DNA double-strand break (DSB) repair that is mechanistically distinct from its cell cycle checkpoint function. We demonstrate that p21-deficient cells exhibit elevated chromatid-type aberrations, including gaps and breaks, dicentrics and radial formations, following exposure to several DSB-inducing agents. p21 –/– cells also exhibit an increased DNA damage-inducible DNA-PK CS S2056 phosphorylation, indicative of elevated non-homologous DNA end joining. Concomitantly, p21 –/– cells are defective in replication-coupled homologous recombination (HR), exhibiting decreased sister chromatid exchanges and HR-dependent repair as determined using a crosslinked GFP reporter assay. Importantly, we establish that the DSB hypersensitivity of p21 –/– cells is associated with increased cyclin-dependent kinase (CDK)-dependent BRCA2 S3291 phosphorylation and MRE11 nuclear foci formation and can be rescued by inhibition of CDK or MRE11 nuclease activity. Collectively, our results uncover a novel mechanism by which p21 regulates the fidelity of replication-coupled DSB repair and the maintenance of chromosome stability distinct from its role in the G1-S phase checkpoint.
    Print ISSN: 0305-1048
    Electronic ISSN: 1362-4962
    Topics: Biology
    Published by Oxford University Press
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  • 4
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    Relationship between cadmium sensitivity and degree of plasma membrane fatty acid unsaturation in Saccharomyces cerevisiae (1997)
    Springer
    Details
    Publication Date: 1997-10-24
    Print ISSN: 0175-7598
    Electronic ISSN: 1432-0614
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Published by Springer
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